Add more information in notification mails (See FS#873)

darcs-hash:20081012121943-19e2d-18381df36799928d1d91168d83fca80a8012c328.gz

inc/lang/en/subscribermail.txt

@@ -7,6 +7,12 @@ Here are the changes:
 @DIFF@
 --------------------------------------------------------
 
+Date        : @DATE@
+User        : @USER@
+IP-Address  : @IPADDRESS@
+Hostname    : @HOSTNAME@
+Edit Summary: @SUMMARY@
+
 To cancel the page notifications, log into the wiki at
 @DOKUWIKIURL@ then visit
 @NEWPAGE@